138971 (2001 CB21)

NEO PHA MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.3333956066 ± 2.78e-09
Semi-major axis (a)1.0335726681 AU ± 1.43e-10
Inclination (i)7.91834368° ± 6.35e-07
Long. of Asc. Node (Ω)353.64713274° ± 2.04e-06
Arg. of Perihelion (ω)271.93550869° ± 1.82e-06
Mean Anomaly (M)131.04916712° ± 8.25e-07
Mean Motion (n)0.9379954932°/day ± 1.95e-10
Perihelion dist (q)0.68898408 AU ± 2.87e-09
Aphelion dist (Q)1.37816125 AU ± 2.87e-09
Orbital Period1.05077934 yr ± 2.19e-10
Physical Parameters
H (abs. magnitude)18.54
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-05-31
RMS Residual0.368″
Uncertainty0
Orbit TypeApollo
MOID0.023880 AU
Observations Used2563
Radar Obs Used2
Oppositions1
Arc Total2001-2026
First Observation Used2001-02-02
Last Observation Used2026-01-13
Observations (3014)
Date Type RA Dec Mag Band Observatory
2023-12-28 12:21:44 s 1 +157471.59 3 +287279.58 40.0 C57
2023-12-28 12:41:44 S 06 46 40.507 +49 41 20.98 V C57
2023-12-28 12:41:44 s 1 +156819.06 5 +287560.78 3810.0 C57
2023-12-28 13:01:45 S 06 46 37.543 +49 41 27.10 V C57
2023-12-28 13:01:45 s 1 +156165.22 7 +287839.57 7960.0 C57
2023-12-28 13:21:45 S 06 46 33.149 +49 41 28.50 V C57
2023-12-28 13:21:45 s 1 +155507.74 6 +288111.76 5720.0 C57
2023-12-28 14:01:45 S 06 46 24.749 +49 41 34.55 V C57
2023-12-28 14:01:45 s 1 +154185.23 7 +288642.28 5340.0 C57
2023-12-28 14:21:45 S 06 46 21.019 +49 41 43.08 V C57
2023-12-28 14:21:45 s 1 +153520.28 1 +288900.69 8150.0 C57
2023-12-28 14:41:44 S 06 46 17.479 +49 41 43.30 V C57
2023-12-28 14:41:44 s 1 +152852.84 5 +289154.50 3040.0 C57
2023-12-28 15:21:44 S 06 46 09.120 +49 41 47.62 V C57
2023-12-28 15:21:44 s 1 +151510.58 3 +289648.24 9510.0 C57
2023-12-28 15:41:44 S 06 46 05.136 +49 41 53.05 V C57
2023-12-28 15:41:44 s 1 +150835.77 5 +289888.18 1330.0 C57
2023-12-28 16:01:45 S 06 46 00.353 +49 42 02.38 V C57
2023-12-28 16:01:45 s 1 +150158.50 7 +290123.44 5630.0 C57
2023-12-28 16:41:45 S 06 45 52.594 +49 41 57.26 V C57
2023-12-28 16:41:45 s 1 +148796.70 2 +290580.04 2350.0 C57
2023-12-28 17:41:44 S 06 45 40.411 +49 42 08.96 V C57
2023-12-28 17:41:44 s 1 +146735.79 9 +291229.74 8950.0 C57
2023-12-28 18:01:44 S 06 45 35.887 +49 42 18.22 V C57
2023-12-28 18:01:44 s 1 +146043.99 8 +291436.86 630.0 C57
2023-12-28 18:21:44 S 06 45 33.382 +49 42 21.56 V C57
2023-12-28 18:21:44 s 1 +145349.82 1 +291639.29 5660.0 C57
2023-12-28 18:41:44 S 06 45 27.895 +49 42 21.92 V C57
2023-12-28 18:41:44 s 1 +144653.24 2 +291836.96 4050.0 C57
2023-12-28 19:01:43 S 06 45 24.130 +49 42 27.68 V C57
2023-12-28 19:01:43 s 1 +143954.26 3 +292029.83 5880.0 C57
2023-12-28 19:21:45 S 06 45 20.208 +49 42 25.60 V C57
2023-12-28 19:21:45 s 1 +143252.92 7 +292217.99 1390.0 C57
2023-12-28 20:01:45 S 06 45 12.084 +49 42 40.79 V C57
2023-12-28 20:01:45 s 1 +141843.11 0 +292579.86 3560.0 C57
2023-12-28 20:21:44 S 06 45 07.922 +49 42 38.20 V C57
2023-12-28 20:21:44 s 1 +141134.67 5 +292753.62 530.0 C57
2023-12-28 20:41:44 S 06 45 04.416 +49 42 41.00 V C57
2023-12-28 20:41:44 s 1 +140423.87 8 +292922.53 1530.0 C57
2023-12-28 21:41:44 S 06 44 52.152 +49 42 54.90 V C57
2023-12-28 21:41:44 s 1 +138277.43 0 +293400.20 9910.0 C57
2023-12-28 22:21:45 S 06 44 43.702 +49 42 59.04 V C57
2023-12-28 22:21:45 s 1 +136834.82 3 +293694.28 1130.0 C57
2023-12-28 22:41:45 S 06 44 39.914 +49 42 59.54 V C57
2023-12-28 22:41:45 s 1 +136110.05 0 +293833.97 8770.0 C57
2023-12-28 23:01:45 S 06 44 35.858 +49 43 01.63 V C57
2023-12-28 23:01:45 s 1 +135382.95 8 +293968.72 1230.0 C57
2023-12-28 23:21:44 S 06 44 30.922 +49 43 13.98 V C57
2023-12-28 23:21:44 s 1 +134653.59 0 +294098.59 8700.0 C57
2023-12-28 23:41:44 S 06 44 27.346 +49 43 16.00 V C57
Radar Observations (2)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
2006-10-02 20:11:00 -9701.3065 0.5 Hz 2380 -1 -1
2006-10-02 21:29:00 47834014.65 1.5 us 2380 -1 -1
Station codes
-1 Arecibo (305-m, 1963–2020)